Corrosion Under Insulation (CUI) Guidelines EFC



Introduction

Corrosion-under-insulation (CUI) refers to the external corrosion of piping and vessels fabricated from carbon–manganese, low-alloy and austenitic stainless steels that occurs underneath externally clad or jacketed insulation owing to the penetration of water. By its very nature, CUI tends to remain undetected until the insulation and cladding or jacketing are removed to allow inspection or when leaks to atmosphere occur. CUI is a major common problem on a worldwide basis that is shared by all the refi ning, petrochemical,

power, industrial, onshore and offshore industries. It is not a new problem,

but it can be a serious problem. CUI has been responsible for many

major leaks that lead to health and safety incidents, result in lost production

and are responsible for the large maintenance budgets which are

required to mitigate the problem.

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